i think it depends on your training protocol....

for example, on Mark Rippetoe's Program you do 3x5 (3 sets of 5 reps) for squat and bench...keeping the same weight...

then on Bill Starr's you do 5x5 increasing the weight per set.....

then on DC Training, you do 20-30 reps using the rest-pause technique..

my point is not to confuse you lol, but to tell you that whichever program you attempt, its gonna have different protocols which will define how many sets/reps you will do... what you need to focus on IMHO is to make sure that your doing a training system which has a lot of compound movements...!!

so even if your on Arnold's program, as long as your doing all the exerices he's listed its ok.....
Anuj

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